Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With waveguide or long line
Patent
1995-10-25
1997-08-12
Wieder, Kenneth A.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With waveguide or long line
455 671, 455115, 324 7611, G01R 2306, G01R 2104, G01R 2100
Patent
active
056569297
ABSTRACT:
An economical, wide range and accurate power measurement technique switches an RF detector between an applied RF IN to be measured and a COMPARISON RF IN, to thus develop a difference signal. The difference signal is filtered, amplified by a logarithmic amplifier, and then converted into a DC error signal by a synchronous detector operating in step with the switching of the RF detector. The DC error signal is applied to an integrator whose output is a loop control signal. Assuming a square law detector, the square of the loop control signal is linearly proportional to the applied RF IN once a servo loop is hulled by making COMPARISON RF IN equal to RF IN. The desired power measurement is performed by digitizing the loop control signal and performing the appropriate arithmetic operations thereon. The loop control signal is also applied to an analog multiplier, where it combines with an internal RF reference signal to produce, at the output of an attenuator following the multiplier, the COMPARISON RF SIGNAL. The entire loop servos to minimize the difference between the applied RF IN and the COMPARISON RF SIGNAL. When RF IN gets small an increase in attenuation allows the multiplier to continue to operate within an optimum dynamic range by reducing the COMPARISON RF SIGNAL to the same general level as RF IN.
REFERENCES:
patent: 4341994 (1982-07-01), Kawasaki et al.
patent: 4673870 (1987-06-01), Strickland et al.
patent: 5493210 (1996-02-01), Orndorff et al.
Bowser Barry C.
Hewlett--Packard Company
Miller Edward L.
Wieder Kenneth A.
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